utilisation vs utilization

utilisation and utilization both are nouns.

Word	Noun	Adjective	Verb	Adverb
utilisation	Yes	No	No	No
utilization	Yes	No	No	No

As nouns, utilisation and utilization are synonyms defined as:

Other synonyms of utilisation include employment, exercise, usage, use.

utilisation (noun)	utilization (noun)
the act of using	the act of using
	the state of having been made use of